Senior Offensive Security Engineer

Overview

Senior Offensive Security Engineer to mature Delinea's in-house Offensive Security program, leading red and purple team operations and penetration testing across the enterprise and products. This role is fully remote and based in the United States.

What you'll do

• Lead the build out of red and purple team operations, emulating real-world adversary TTPs to test security controls and detection and response capabilities.
• Lead internal and external network and infrastructure penetration tests across enterprise and product environments, including Azure and AWS.
• Identify and exploit attack paths in identity infrastructure, including Active Directory, Entra ID, Kerberos, and credential and secrets exposure.
• Perform source code review in support of testing engagements, leveraging findings to execute targeted attacks.
• Create or reproduce and demonstrate proof-of-concept exploits for findings and externally reported vulnerabilities.
• Plan and execute penetration testing engagements from beginning to end, including scoping, rules of engagement, testing, documentation, reporting, and remediation validation.
• As needed, perform manual and automated security testing of web applications, APIs, desktop and agent-based clients, and cloud services, with a focus on authentication, authorization, session management, and privileged access workflows.
• Write clear penetration test reports, including reproduction steps, risk ratings, business impact, and actionable remediation guidance.
• Partner with Product Development, DevOps, and IT teams to explain findings, support root cause analysis, and validate remediation.
• Develop and maintain custom tools, scripts, and automation to improve testing efficiency and coverage.
• Contribute to testing methodologies, playbooks, and testing environments, including the use of frontier AI models in the evaluation of product sources and attack paths.
• Stay current on emerging vulnerabilities, exploitation techniques, and attacker tradecraft, and share knowledge with the team and the broader engineering organization.
• Communicate effectively with stakeholders at all levels, translating technical findings into actionable insights for technical and non-technical audiences.

What you'll need

• Bachelor's degree in Computer Science, Cybersecurity, Engineering, or a related technical field, or equivalent work experience.
• Minimum 3+ years of demonstrated, hands-on experience with internal and external web application, API, and network penetration testing, including writing formal penetration test reports that document test details, vulnerabilities, and risks.
• Understanding of penetration testing methodology and frameworks (MITRE ATT&CK, OWASP, PTES), including the OWASP Top 10 and OWASP API Security Top 10.
• Hands-on experience with industry-standard offensive tooling, such as Burp Suite, Nmap, Metasploit, BloodHound, and Impacket.
• Experience testing identity and authentication mechanisms, including Active Directory, Entra ID, Kerberos, OAuth 2.0, OpenID Connect, and SAML.
• Proficiency in at least one scripting or programming language, such as Python, Go, or PowerShell, for tooling, automation, and exploit development.
• Ability to read and review source code in common languages, such as C#, Java, or JavaScript/TypeScript, to identify security vulnerabilities.
• Experience with Azure and AWS cloud-based infrastructure.
• Understanding of the Secure Software Development Lifecycle (SSDLC).
• Skill in illustrating and explaining security vulnerabilities, including proof-of-concept demonstrations, to audiences with minimal expertise in security.
• Ability to manage multiple engagements concurrently and meet deadlines with minimal supervision.

Nice to have

• One or more of the following certifications: ARTE, BSCP, CARTS, CRTL, CRTO, CRTP, eCPPT, eWPT, GPEN, GWAPT, OSCP, OSEP, OSWE, Pentest+, PNPT.
• Experience with command-and-control frameworks, such as Cobalt Strike, Sliver, or Mythic, and adversary emulation.
• Experience testing containerized and cloud-native environments, including Kubernetes, infrastructure-as-code, and CI/CD pipeline security.
• Experience testing identity and access management, privileged access management, or secrets management products.
• Experience using AI and LLM-based agents and tooling in testing methodologies and testing AI and LLM-based features and agents, including prompt injection and the OWASP Top 10 for LLM Applications.
• Published CVEs, bug bounty participation, CTF competition, or other public security research contributions.
• Experience working with high-security environments subject to regulations such as FedRAMP or ITAR.
• Excellent analytical and problem-solving skills with a keen attention to detail.

Details

• Location: United States, fully remote.
• Reports to the Sr. Manager, Offensive Security.
• Candidates requiring any type of US work authorization now or in the future (including F1-OPT, F1-CPT, H-1B, TN, L-1, J1) are not being considered.